17.05 - Quality of Statistics As a Function of Sample Size - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Manipulation Language

Product
Advanced SQL Engine
Teradata Database
Release Number
17.05
Release Date
January 2021
Content Type
Programming Reference
Publication ID
B035-1146-175K
Language
English (United States)

The larger the sample size used to collect statistics, the more likely the sampled statistics are an accurate representation of population statistics. There is a trade-off for this accuracy: the larger the sample size, the longer it takes to collect the statistics.

You cannot use sampling to collect COLUMN statistics for the partitioning columns of row-partitioned tables and you should not use sampling to collect INDEX statistics for those columns. The collect statistics on the system-derived PARTITION or PARTITION#Ln columns.